The WM8850 is a high performance multi-channel audio code designed for high performance PC audio systems. The device offers full compatibility with the Intel High Definition Audio (HDA) specification revision 1.0, allowing seamless integration with industry-standard HDA controllers. The WM8850 has three high performance stereo DACs to enable six channels of high definition audio, ideal for 5.1 channel applications. A high-performance ground-referenced stereo headphone amplifier utilizes advanced charge pump and DC servo technology to minimize system cost and space without compromise on audio quality. Line outputs provide a high-quality differential connection to speaker amplifiers, enabling common mode noise rejection when these traces are routed across a PCB. The WM8850 also has two high performance stereo ADCs to provide hi-fi quality analog line-in and microphone input digitization. A low noise microphone bias with programmable output voltage is provided. Additionally, the codec contains a digital microphone interface capable of supporting up to four independent digital microphones. One differential stereo input is provided for line level signals, while one pseudo-differential stereo input with integrated microphone preamplifier is provided. The WM8850 also contains a S/PDIF transceiver which is fully compatible with IEC-60958-3. The S/PDIF receive and transmit paths each contain a sample rate converter (SRC) to enable asynchronous sample rate conversion between the S/PDIF receive/transmit and HDA interface clock domains. An additional S/PDIF transmitter is provided to allow direct output of a stereo stream from the HDA interface. The WM8850 is supplied in a small 48-pin QFN package.